Sketch of the device including the optical fiber and the e-beam transport to the second undulator.
Intracavity FEL intensity evolution for the first, second, and third harmonics. , , , , , , , , , and . The first harmonic is tuned at .
(a) Longitudinal profile of the first (continuous) and second (dash) harmonic profiles at the 45-round trip. The dot curve reproduces the electron bunch shape. Both pulses have been normalized to unity and the ratio between the maxima is . Same parameters in Fig. 1. (b) Same as (a) for the first and third harmonics .
Harmonic pulse widths vs the round trip number, same parameters in Fig. 2.
(a) Pulse evolution vs length in meters in the second undulator of the optical power at about 500 nm; the maximum power corresponds to . (b) Pulse evolution of the third harmonic (166 nm), . (c) Pulse evolution of the fifth harmonic (100 nm), . The dotted curve refers to the electron bunch.
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